[TD] add property for section line style

see https://forum.freecadweb.org/viewtopic.php?f=35&t=44320

src/Mod/TechDraw/Gui/QGISectionLine.cpp

@@ -285,6 +285,12 @@ QColor QGISectionLine::getSectionColor()
 }
 
 //SectionLineStyle
+void QGISectionLine::setSectionStyle(int style)
+{
+    Qt::PenStyle sectStyle = static_cast<Qt::PenStyle> (style);
+    setStyle(sectStyle);
+}
+
 Qt::PenStyle QGISectionLine::getSectionStyle()
 {
     Base::Reference<ParameterGrp> hGrp = App::GetApplication().GetUserParameter().GetGroup("BaseApp")->

src/Mod/TechDraw/Gui/QGISectionLine.h

@@ -54,6 +54,7 @@ public:
     void setDirection(double xDir,double yDir);
     void setDirection(Base::Vector3d dir);
     void setFont(QFont f, double fsize);
+    void setSectionStyle(int style);
     virtual void draw();
 
 protected:

src/Mod/TechDraw/Gui/QGIViewPart.cpp

@@ -848,6 +848,7 @@ void QGIViewPart::drawSectionLine(TechDraw::DrawViewSection* viewSection, bool b
         QGISectionLine* sectionLine = new QGISectionLine();
         addToGroup(sectionLine);
         sectionLine->setSymbol(const_cast<char*>(viewSection->SectionSymbol.getValue()));
+        sectionLine->setSectionStyle(vp->SectionLineStyle.getValue());
 
         //TODO: handle oblique section lines?
         //find smallest internal angle(normalDir,get?Dir()) and use -1*get?Dir() +/- angle

src/Mod/TechDraw/Gui/ViewProviderViewPart.cpp

@@ -56,6 +56,14 @@ using namespace TechDrawGui;
 
 PROPERTY_SOURCE(TechDrawGui::ViewProviderViewPart, TechDrawGui::ViewProviderDrawingView)
 
+const char* ViewProviderViewPart::LineStyleEnums[] = { "NoLine",
+                                                  "Continuous",
+                                                  "Dash",
+                                                  "Dot",
+                                                  "DashDot",
+                                                  "DashDotDot",
+                                                  NULL };
+
 //**************************************************************************
 // Construction/Destruction
 
@@ -100,6 +108,9 @@ ViewProviderViewPart::ViewProviderViewPart()
 
     //properties that affect Section Line
     ADD_PROPERTY_TYPE(ShowSectionLine ,(true)    ,dgroup,App::Prop_None,"Show/hide section line if applicable");
+    int defLineStyle = hGrp->GetFloat("SectionLine", 2);
+    SectionLineStyle.setEnums(LineStyleEnums);
+    ADD_PROPERTY_TYPE(SectionLineStyle, (defLineStyle), dgroup, App::Prop_None, "Show/hide section line if applicable");
     
     //properties that affect Detail Highlights
     ADD_PROPERTY_TYPE(HighlightAdjust,(0.0),hgroup,App::Prop_None,"Adjusts the rotation of the Detail highlight");
@@ -127,6 +138,7 @@ void ViewProviderViewPart::onChanged(const App::Property* prop)
         prop == &(ArcCenterMarks) ||
         prop == &(CenterScale) ||
         prop == &(ShowSectionLine)  ||
+        prop == &(SectionLineStyle) ||
         prop == &(HorizCenterLine)  ||
         prop == &(VertCenterLine) ) {
         // redraw QGIVP

src/Mod/TechDraw/Gui/ViewProviderViewPart.h

@@ -52,9 +52,12 @@ public:
     App::PropertyBool   HorizCenterLine;
     App::PropertyBool   VertCenterLine;
     App::PropertyBool   ShowSectionLine;
+    App::PropertyEnumeration   SectionLineStyle;
     App::PropertyFloat  HighlightAdjust;
     App::PropertyBool   ShowAllEdges;
 
+    static const char* LineStyleEnums[];
+
     virtual void attach(App::DocumentObject *);
     virtual void setDisplayMode(const char* ModeName);
     virtual bool useNewSelectionModel(void) const {return false;}